3f9206c9-e391-41ef-be95-df50d4ab7e52 English series series 2026-03-17T14:20:59 MEDIN 3.1.2 geoscientificInformation oceans society Palaeoclimatic indicators and parameters SeaDataNet Parameter Discovery Vocabulary 2023-12-12 revision Marine archaeology SeaDataNet Parameter Discovery Vocabulary 2023-12-12 revision Sediment age SeaDataNet Parameter Discovery Vocabulary 2023-12-12 revision Geotechnics SeaDataNet Parameter Discovery Vocabulary 2023-12-12 revision Research The Crown Estate Renewable Energy Development Phases 2012-05-15 revision Renewable Energy Lease area The Crown Estate Renewable Energy Development Areas 2012-05-15 revision Geology GEMET - INSPIRE themes, version 1.0 2009-07-31 revision SeaDataNet sea areas 2012-11-07 revision North Sea SeaVoX Vertical Co-ordinate Coverages 2020-05-21 revision soil and sediment 2014-07-01T00:00:00 2014-07-01T23:59:59 0.7787 1.4544 52.6255 53.284 TCE-325 Marine Data Exchange 2014, Wessex Archaeology, Dudgeon, Stages 1 to 3 Geoarchaeological and Palaeoenvironmental Assessment Stages 1 to 3 Geoarchaeological and Palaeoenvironmental Assessment 2021-05-17T13:34:51 publication English Wessex Archaeology was commissioned by Royal Haskoning DHV to undertake Stage 1 to 3 geoarchaeological and palaeoenvironmental assessment of borehole samples from the site of the proposed Dudgeon Offshore Windfarm. The Stage 1 work comprised the assessment of 27 borehole logs and 32 CPT (Cone Penetrometer Test) logs. The Stage 2 work comprised the geoarchaeological recording and subsampling of 63 samples from 6 boreholes (BH06, BH13, BH15, BH19A, BH21 and BH25). The following geological formations were interpreted from the Stage 1 and 2 work: • Chalk Bedrock • Swarte Bank Formation • Egmond Ground Formation • Bolders Bank Formation • Holocene terrestrial sediments • Seabed Sediment The Pleistocene sediments including the Swarte Bank, Egmond Ground and Bolders Bank formation were identified as glacial and shallow marine deposits thought to have been deposited during the Lower and Middle Palaeolithic archaeological periods. The Holocene terrestrial sediments were subjected to Stage 3 palaeoenvironmental assessment with two boreholes BH06 and BH21 providing the focus for study. Assessment for pollen, diatoms, foraminifera, ostracods, plants and molluscs was undertaken in conjunction with radiocarbon dating revealing interesting freshwater and estuarine environments dating to the Mesolithic archaeological period. In addition, the dating suggests that sediments within borehole BH06 might also relate to the Storegga slide tsunami which is thought to have affected Mesolithic communities in the North Sea area around 8100 years ago. Stage 4 analysis of pollen, foraminifera, ostracods, plants and molluscs and further radiocarbon dating is recommended in particular to better understand the interesting sediments within borehole BH06. There will be no limitations when published on the Marine Data Exchange otherRestrictions Data Must be used in accordance to the Marine Data Exchange's Terms of Use: https://www.marinedataexchange.co.uk/content/info/terms-of-use otherRestrictions The Crown Estate +44 020 7851 5000 enquiries@thecrownestate.co.uk custodian Euan McNeill Wessex Archaeology Director, Coastal & Marine 01722 326867 e.mcneill@wessexarch.co.uk originator The Crown Estate +44 020 7851 5000 enquiries@thecrownestate.co.uk distributor Orsted Customer-questions@orsted.com owner asNeeded Documents https://www.marinedataexchange.co.uk/details/TCE-325/summary A link to the web service or dataset. https://www.marinedataexchange.co.uk A link to the general host site. Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services 2010-12-08T00:00:00 publication Conformity with the Commission Regulation (EU) No 1089/2010 was either not relevant to this dataset or not a requirement of the Marine Data Exchange for the creation and submission of this dataset; therefore, conformity has not been assessed and cannot be declared False series Stage 1 Review The Stage 1 review comprised the assessment of 27 borehole logs from 26 locations generated by the Danish geotechnical company GEO during July and August 2013 the most recent versions of which (GEO 2014) are given in Appendix 1. In order to obtain maximum archaeological information from the survey this process was enhanced by a presentation, given by Jack Russell on 11th July aboard the MV Blue Beta whilst it was alongside in Great Yarmouth to explain fully the archaeological requirements. A list of potential locations and depths of interest was also compiled based on previous geophysical, geotechnical and archaeological surveys in the area. A further 32 CPT logs generated during geotechnical survey by the MV Blue Beta during March 2014 were also reviewed in order to provide archaeological input into the limited sampling survey which was subsequently undertaken (Appendix 2). Samples were retained for geoarchaeolgical recording in two forms. Firstly, sections of samples which were extruded on board the MV Blue Beta deemed worthy of further palaeoenvironmental work but not required for geotechnical work were retained in bags or “Waxed Quarts”. A number of samples were also identified to be of geological and geoarchaeological importance and were retained intact within their steel shelby liners for on-shore extrusion and potential archaeological and palaeoenvironmental assessments. Stage 2 Geoarchaeological recording and subsampling The samples were transported to WA’s environmental processing laboratory, where they were geoarchaeologically recorded. Each bagged sample was opened and core samples were split longitudinally, photographed and recorded. The descriptions (Appendix 3) provided details of the depth to each sediment horizon, the character and form of the sediment. Sedimentary characteristics recorded included texture, colour and depositional structure. Subsamples were taken from relevant deposits in order to provide chronological and environmental information relating to their formation. The selections were made on the basis of the sediment identified from the geoarchaeological recording of the samples. Samples taken were targeted at sediments thought to be of potential geological, geoarchaeological and palaeoenvironmental interest. The positions and depths of the samples are shown on Figures 2 to 3 and in the table below. Stage 3 Palaeoenvironmental assessment and dating 2.3.1 Eighteen sediment samples from boreholes BH02, BH06 and BH21 of approximately 25cm3 were taken for foraminifera, ostracod assessment. The samples were broken into small pieces by hand, placed in ceramic bowls, and dried in an oven. Boiling-hot water was then poured over them, with a little sodium carbonate added to help disaggregate the clay fraction. Each was left to soak overnight. Washing was with hand-hot water through a 75 micron sieve, the remaining residue being returned to the ceramic bowl for final drying in the oven. The samples were then stored in labelled plastic bags. For examination, each sample was placed in a nest of sieves (>50, >250, >150 microns, and base pan) and thoroughly shaken. A little of each grade was then sprinkled onto a picking tray and viewed under a binocular microscope. “Organic Remains” from the three boreholes were logged on a presence/absence basis. Identification follows Murray (2006) for the foraminifera, and Athersuch, Horne & Whittaker (1989) and Meisch (2000) for the brackish/marine and freshwater ostracods, respectively. 2.3.2 Eighteen sediment samples from boreholes BH02, BH06 and BH21 of approximately 4cm3 were taken for pollen and diatom assessment. These were taken to the University of Southampton for preparation. The Crown Estate +44 020 7851 5000 enquiries@thecrownestate.co.uk pointOfContact EPSG Geodetic Parameter Registry 2022-12-12 revision WGS 84 / UTM zone 31N